export function download (url: string, filename: string) {
  getBlob(url, function (blob: string) {
    saveAs(blob, filename)
  })
};

function getBlob (url: string, cb: (v: string) => void) {
  var xhr = new XMLHttpRequest()

  xhr.open('GET', url, true)

  xhr.responseType = 'blob'

  xhr.onload = function () {
    if (xhr.status === 200) {
      cb(xhr.response)
    }
  }

  xhr.send()
}

function saveAs (blob: string, filename: string) {
  const navigator = window.navigator as unknown as { msSaveOrOpenBlob: string, msSaveBlob: (b: string, f: string) => void }
  if (navigator.msSaveOrOpenBlob) {
    navigator.msSaveBlob(blob, filename)
  } else {
    var link = document.createElement('a')

    var body = document.querySelector('body')

    link.href = window.URL.createObjectURL(blob as any)

    link.download = filename

    // fix Firefox

    link.style.display = 'none'

    if (body) {
      body.appendChild(link)
    }

    link.click()

    if (body) {
      body.removeChild(link)
    }

    window.URL.revokeObjectURL(link.href)
  };
}
